Handheld vacuum cleaner



FIG. 1 is a side perspective view of a handheld vacuum cleaner showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a front elevational view thereof. 

The ornamental design for a handheld vacuum cleaner, as shown. 